Average Monthly Sunshine hours in O'Fallon (IL)
This graph shows the average number of hours per month that O'Fallon receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.
- On average, July is the sunniest month with 311 hours of sunshine.
- December has on average the lowest amount of sunshine with 128 hours.
- On average, the total annual amount of sun is 2612 hours.
Forecast: is it sunny in O'Fallon (IL)?
almost clear and no rain
broken clouds and thunder
broken clouds and thunder